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New Journal of Chemistry
Page 4 of 4
DOI: 10.1039/C7NJ00844A
Letter
Journal Name
Table1 Electrocatalytic asymmetric hydrogenation of ketonesa
trifluoroacetophenon. High temperature and pressure are not
applied in the preparation of Pt@Cu NPs and the
electroreduction of aromatic ketones. All experimental
procedures are performed under mild conditions. Moreover,
Pt@Cu NPs sustain high activity after recycling for six times.
Pt@Cu NPs could be used as excellent electrocatalysts due to
their large surface area, good stability, favorable reusability
and high conductivity.
Entry
1
Cathode
Pt@Cu-1
Pt@Cu-2
Pt@Cu-2
Pt@Cu-3
Pt
Substrate T (oC)
Yieldb (%)
21
25
64
16
16
12
19
14
54
46
36
27
26
14
6
R-eeb (%)
47
59
0
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1a
1b
1c
1d
5
5
2
3c
5
4
5
50
6
5
5
6
Cu
5
0
7
Pt NPs
5
28
0
8
Cu NPs
5
Acknowledgements
9
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
Pt@Cu-2
25
20
15
10
7.5
2.5
0
16
19
25
33
44
63
71
78
83
87
89
39
23
41
10
11
12
13
14
15
16
17
18
19
20
21
22
Financial support from National Natural Science Foundation of
China (21373090, 21473060, 21673078) is gratefully
acknowledged.
Notes and references
-5
-10
-15
-20
5
5
5
1
2
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,
5
5
18
4
5
a
Anode: Mg, 20 mL co-solvent (MeCN/n-amyl alcohol=1/1), 0.1 M substrate: 1a,
supporting electrolyte: 0.1 M TEAI, inducer: 3 mM CD, current density: 2 mA cm-2,
charge: 2 F mol-1. b Determined by GC with a chiral column. c With no CD.
6
7
8
9
T. Yamamura, H. Nakatsuka, S. Tanaka and M. Kitamura,
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particle morphology after being used for six times, and only a
small portion of particles agglomerates into large ones. In
addition, no phase separation occurs between Pt NPs and Cu
NPs. The XRD patterns of Pt@Cu-2 NPs before and after being
used for six times show no significant differences in the
stability test (curve e in Fig. 1D). Therefore, the Pt@Cu NP
electrode prepared in this work is reusable and stable, thereby
exhibiting potential for practical applications.
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70
ee
yield
60
50
40
30
20
10
0
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Recycle times
Fig. 4 Reuse of the Pt@Cu-2 NPs cathode. Reaction condition as given in Table 1, entry
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2.
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Conclusions
Pt@Cu NPs with different Pt weight ratios are synthesized.
As a result, these NPs show high catalytic activity and stability
24 H. P. Yang, Q. Fen, H. Wang and J. X. Lu, Electrochem.
Commun., 2016, 71, 38-42.
for
the
asymmetric
hydrogenation
of
2,2,2-
4 | J. Name., 2012, 00, 1-3
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